/*
 * Copyright © 2013 Intel Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of the copyright holders not be used in
 * advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.  The copyright holders make
 * no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "config.h"

#include <string.h>
#include <stdio.h>
#include <EGL/egl.h>
#include <wayland-egl.h>
#include <GLES2/gl2.h>

#include "weston-test-client-helper.h"
#include "../shared/platform.h"

#define fail(msg) { fprintf(stderr, "%s failed\n", msg); return -1; }

struct test_data {
	struct client *client;

	EGLDisplay egl_dpy;
	EGLContext egl_ctx;
	EGLConfig egl_conf;
	EGLSurface egl_surface;
};

static int
init_egl(struct test_data *test_data)
{
	struct wl_egl_window *native_window;
	struct surface *surface = test_data->client->surface;
	const char *str, *mesa;

	static const EGLint context_attribs[] = {
		EGL_CONTEXT_CLIENT_VERSION, 2,
		EGL_NONE
	};

	EGLint config_attribs[] = {
		EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
		EGL_RED_SIZE, 1,
		EGL_GREEN_SIZE, 1,
		EGL_BLUE_SIZE, 1,
		EGL_ALPHA_SIZE, 0,
		EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
		EGL_NONE
	};

	EGLint major, minor, n;
	EGLBoolean ret;

	test_data->egl_dpy =
		weston_platform_get_egl_display(EGL_PLATFORM_WAYLAND_KHR,
						test_data->client->wl_display,
						NULL);
	if (!test_data->egl_dpy)
		fail("eglGetPlatformDisplay or eglGetDisplay");

	if (eglInitialize(test_data->egl_dpy, &major, &minor) != EGL_TRUE)
		fail("eglInitialize");
	if (eglBindAPI(EGL_OPENGL_ES_API) != EGL_TRUE)
		fail("eglBindAPI");

	ret = eglChooseConfig(test_data->egl_dpy, config_attribs,
			      &test_data->egl_conf, 1, &n);
	if (!(ret && n == 1))
		fail("eglChooseConfig");

	test_data->egl_ctx = eglCreateContext(test_data->egl_dpy,
					      test_data->egl_conf,
					      EGL_NO_CONTEXT, context_attribs);
	if (!test_data->egl_ctx)
		fail("eglCreateContext");

	native_window =
		wl_egl_window_create(surface->wl_surface,
				     surface->width,
				     surface->height);
	test_data->egl_surface =
		weston_platform_create_egl_window(test_data->egl_dpy,
						  test_data->egl_conf,
						  native_window, NULL);

	ret = eglMakeCurrent(test_data->egl_dpy, test_data->egl_surface,
			     test_data->egl_surface, test_data->egl_ctx);
	if (ret != EGL_TRUE)
		fail("eglMakeCurrent");

	/* This test is specific to mesa 10.1 and later, which is the
	 * first release that doesn't accidentally triple-buffer. */
	str = (const char *) glGetString(GL_VERSION);
	mesa = strstr(str, "Mesa ");
	if (mesa == NULL)
		skip("unknown EGL implementation (%s)\n", str);
	if (sscanf(mesa + 5, "%d.%d", &major, &minor) != 2)
		skip("unrecognized mesa version (%s)\n", str);
	if (major < 10 || (major == 10 && minor < 1))
		skip("mesa version too old (%s)\n", str);

	return 0;
}

TEST(test_buffer_count)
{
	struct test_data test_data;
	uint32_t buffer_count;
	int i;

	test_data.client = client_create(10, 10, 10, 10);
	if (!test_data.client->has_wl_drm)
		skip("compositor has not bound its display to EGL\n");

	if (init_egl(&test_data) < 0)
		skip("could not initialize egl, "
		     "possibly using the headless backend\n");

	/* This is meant to represent a typical game loop which is
	 * expecting eglSwapBuffers to block and throttle the
	 * rendering to a sensible frame rate. Therefore it doesn't
	 * expect to have to install a frame callback itself. I'd
	 * imagine this is what a typical SDL game would end up
	 * doing */

	for (i = 0; i < 10; i++) {
		glClear(GL_COLOR_BUFFER_BIT);
		eglSwapBuffers(test_data.egl_dpy, test_data.egl_surface);
	}

	buffer_count = get_n_egl_buffers(test_data.client);

	printf("buffers used = %i\n", buffer_count);

	/* The implementation should only end up creating two buffers
	 * and cycling between them */
	assert(buffer_count == 2);
}